444 Mr. T. D. A. Cockerell on 
flowers of Salix, new to New Mexico > A. Cressonit, Rob. 
(the form kansensis, Ckll.) ; and Halictus perdigicis, Okll. 
Perdita chamesarache, Cxkll. 
Perdita sexmaeulata, Ckll. 
Both these species were taken at Roswell, N. M., Aug. 20, 
1902, at flowers of Chameesaracha sordida. 
Epeolus occidentalis, Cr., 9 . 
Exomalopsis solani, Ckll., 9. 
These were taken at Mescalero, N. M., Oct. 1 and 2, at 
flowers of Bigelovia graveolens glabrata. ‘The occurrence of 
the Exomalopsis in this locality is rather surprising. Diadasia 
diminuta, Cr., was taken at Mescalero, Oct. 3, at flowers of 
Spheralcea Fendleri. 
Megachile cleomis lippie, Ckll., 3. 
Roswell, N. M., Aug. 20, 1902 (Cockerell). 
Nomada modocorum, sp. n. 
d .—Length about 94 millim. 
Black and yellow, with red on legs and abdomen. Head 
transversely oval, vertex broad; face, cheeks, and pleura 
covered with white hair; hair on top of head and dorsum of 
thorax ochraceous ; clypeus except narrow hind margin, 
lateral face-marks (broad below, above rapidly narrowing to 
a line which ends about level with the antennz), labrum, 
mandibles except tips, stripe behind lower part of eyes, linear 
marks on hind border of prothorax, tubercles, and semilunar 
mark on lower part of pleura, all lemon-yellow ; no yellow on 
scutellum or metathorax ; mandibles simple; scape swollen, 
yellow beneath, black above; third antennal joint a little 
shorter than fourth; flagellum ferruginous, black above on 
joints 3 to 6, or the first four joints of flagellum proper ; 
mesothorax extremely densely punctured and quite hairy ; 
scutellum inconspicuous; tegule testaceous, punctured. 
Wings nearly clear except the dusky apical margin; stigma 
ferruginous, nervures fuscous; lower inner angle of second 
submarginal cell quite acute; transverso-medial nervure 
joining the discoidal at its base. Legs ferruginous, varied 
with yellow, eoxe mostly black; hind femora blackened 
